Page projector



June 6,1939. A D, EIfZEN 2,160,847

PAGE PROJECTOR ,zar

/zsa /116 IN VENTOR,

15g imma@ ATTORNEY.

June 6, 1939.

HIHIIIllllllllllllll'llll'm Egg A.' D. EITZEN PAGE PROJECTOR Filed Sept.2l, 193

5 2 Sheets-Sheet 2 INVENTOR.

ATTORNEY.

I 15 protected from the h Patented June 6, 1939 PATENT OFFICE PAGEPROJECTOR August D. Eitzen, signor to News York, N. Y., a corpoApplication September 2 f 19 Claims.

This invention relates to page projectors. Among the objects of thepresent invention, it is aimed to provide an improved projecting machinefor association with a page printer includ- 5 ing an improved compactoptical system whereby the optical elements may be so arranged as to behoused in a very narrow cabinet not only to conserve space but also toenhance the appearance of the cabinet. I I

It is still another object of the present invention to provide animproved optical system for a projecting machine especially adapted foruse I with a page printer whereby the lamp may be disposed above theprinter and thus the printer eat of the lamp and an ex sed light beamgniiication with tensive throw of image impres provided to effect theproper ma a given objective lens.

o It is still another object of the present inven- 0 tion to provide animproved tape moving mechanism for effecting the movement of the tape Aacross the light aperture including a continuously operating motor, atape moving roller, a slippage device and a control responsive to adeection in the tape to eiect the movement of a predetermined length oftape across the light aperture, such forinstance as to correspond to thewidth of one orf more line spaces according to the spacing of theprinter.

It is still another object of the present invention to provide animproved combined projecting machine yfor news items and the like and anadvertising machine including lamps and motor for the projecting machineand advertising machine controlledl by the printer associated with theprojecting machine.

It is still another object of the present invention to provide animproved control operatively 40 associated with the ticker whereby notonly the electric circuit for the lamps of a projecting' machine and anadvertising machine but also for the motor of the same is establishedwhen the circuit ofthe ticker is established ready to receive a message.

Among other objects of the present invention," it is aimed to provide animproved mount for-the take-up reel. y I

These and other features, capabilities and advantages of the inventionwill appear from the subjoined detail description of one specificembodiment thereof illustrated in the accompanyingdrawings in whichFigure 1 is a perspective of a cabinet for a Rockville Centre, N. Y.,as- Projection Corporation, New

ration of New York 1, 1935, Serial No. 41,567

machine made according to the present tion;

Fig. 2 i of Fig. 1;

Fig. 3 is a diagram of the wiring used in the 5 present invention forcontrolling the lamps and motor of the machine by the printer;

Fig. 4 is a fragmental perspective of the tape moving device;

Fig. 5 is a section on the line 5-5 of Fig. 4; and 10 Fig. 6` is asection on the line 6-6 of Fig. 4.

In the embodiment shown, there is provided a cabinet I having a base 2mounted upon any suitablestandards or supports, such as the casters 3,3. Extending upwardly from the base 2, there are provided the side walls4, 5 and the front wall 6. Secured to the upper edges of the walls 4, 5and 6, in the present instance, there is provided the top 'I. The frontwall 6 in the present instance l has two openings formed therein, thelower one preferably covered with a pane of glass 8 and the upper onewith a translucent or rear projection screen 9 and an outer pane 9 ofglass.

Above the base 2, there is provided in the present instance ahorizontally extending platform I0 supported in place by the side walls4 and 5. 'Ihe rear of the cabinet I is closable by the removable wall IIwhich is preferably provided with an opening I2 adjacent its lower endacross which opening I2 there is formed a `suitable forarninated screenI3 or the like. The wall II is also' preferably provided with a secondopening I4 in' the present instance disposed above the middle of thewall Il and provided with a foraminated screen I5.

The opening I4 in the present instance forms the upper outlet for the ueI6 for drawing oif the 1 hot air from the upper end of the lamp housingII, the opening I2 in this instance forming an inlet for the freshsupply.

In the present instance secured to the inner face of the front wall 6and extending down from a level above the upper end of the glass windowB to a level 'below the lower end ofthe glass window 8 and in thepresent instance a short distance above the platform I0, there areprovided the supporting plates I8, in the upper ends of which isjournaled the shaft I9 for the sprocket wheels 2U and in the lower endsvof which plates I 8, there is journaled the shaft 2| for the sprocketwheels 22. The shaft I9 is preferably disposed at a level above theupper end of the glass window 8 and the shaft 2| in the present instancewell below the lower end of the glass window 8.

Furthermore, the sprocket wheels 20 are disinvens a transverse sectionon the line 2--2 posed well to one side of the glass window adjacenteach end of the shaft i 3 and the sprocket wheels'22 preferably disposedin alinement with the sprocket wheels 2@ to receive the sprocket chains23. The sprocket chains 23 are intended to support advertising material,such as car cards, to be brought into and out of display positionadjacent the glass window i3 but other than the driving connection inassociation with the combination hereinafter to be described, thisadvertising device forms no part of the present invention.

The shaft'i has xed thereon the worm wheel 2d in mesh with the worm 25on the shaft 25 having fixed on the inner end thereof the sheave 2lconnected by the belt Z8 with the sheave 25 on the shaft 35 of the motor3l mounted on the platform i5, in the present instance, adjacent theprinter or ticker 32 also mounted on the platform lil.

The invention here is directed mainly to a combination including a pageprinter and therefore the printer 32 will be assumed to be of the pageprinter type having a printing wheel 33 and tape discharging rollers 35and 35 above the same for feeding the tape 36 upwardly out of theprinter 32. rIhe tape 36 in the present instance is fed upwardly fromthe supply reel 3l mounted to pivot at 35 on the brackets 39 extendingupwardly from the base 2. In order to facilitate the upward feed of thetape from the reel 3l, there is provided the resilient Whisker itextending upwardly from the base 2 and engaging the tape 35 andyieldably drawing it away from the housing it as indicated in Fig. 2.

After leaving the Whisker lili, the tape passes between the guides d2,passed the printing wheel 33 and then into engagement with the feedrollers 34 and 35 of the printer and from there upwardly in front of thelamp housing il to and over the rod d3 secured to the cheek plates l5and d5 connected to the channel 55 extending across and supported by theside walls l and 5. From the rod Q3, the tape passes down under the ngeril secured to the ends of the levers i8 and 53 fixed to the shaft 50journaled in the cheek plates ld and d5. The finger lll is alsopreferably provided with a resilient Whisker 5lv which engages the tape36 on its way from the rod d3 to the nger di and deflects it inwardlyaway from the front wall 5 thereby to maintain the tape in contact withthe finger il during the feeding impulse.

From the finger di, the tape passes up over the rod 52 and then onto thecylinder 53 preferably composed of cardboard to produce the takeup reel54. The cylinder 53 is mounted to rotate about the axis of the shaft 55journaled in the cheek plate @d and the auxiliary cheek plate 56 alsosecured to the channel iron 45. Fixed to the shaft 55, there is providedthe large gear 5l in mesh with the small gear 58 fixed to the hub 53 ofthe escapement wheel 60 journaled on the shaft 6l.

The eslcapement wheel 60 is preferably provided with a friction driveface 62 preferably engaged by the friction drive facer63 of the sheave5d similarly journaled on the shaft 6i. The sheave 6d is connected bythe belt 65 with the sheave 66 fixed to the shaft I9. v

In order to yieldably maintain the friction faces 63 and 62 in drivingengagement with one another, there is provided the coil spring 51 tensedbetween the disc 68 on the shaft 5l and the collar 69 in engagement withthe roller bearing niemeer unit l@ mounted in the chambered portion iloi the sheave tl.

Fixed to the outer end of the rocker shaft 53, there is provided the armi2 to the lower end of which is pivotally connected the bar 'i5 having aslot lll therein to receive the pin i5 extending from the cheek plate l5and forming a guide for the bar l5. The rear end of the bar lf3 isintended to cooperate with the teeth 'i5 of the escapement wheel 50i.There are four such teeth i5 provided on the escapement wheel 55 in thepresent instance.

From the foregoing, it will thus appear that the rear end of the bar i5will obstruct the path of movement of the teethlt to anchor theescapement wheel 55 against rotation with the sheave 5d when the bar lf3is in its forward position, that corresponding to the uppermost positionof the nger till when the slack in the tape 35 has been taken up by therewind reel 5d due to the driving connection between the sheave 55 andthe escapement wheel 55.

It will furthermore appear that when the feed wheels 3l] and 35 of theticker 32 advance the tape a distance corresponding to one or more linespaces at a time that the slack, thereby formed in the tape between therollers 55, 35 and the rod 33, will, due to the weight of the finger iland arms it and l5 enable the finger il to descend and take up suchslack and thereby in turn rock the shaft 55 to rock the arm i2 and`withdraw the bar H5 out of the path of movement of the teeth 'i5 topermit the friction drive between the sheave titl and escapement wheelt@ to become eective in turn to actuate the gear 58 and thereby therewind reel 5d until the slack has again been taken up, the finger ilraised and thereby the bar i3 again projected into the path of movementof the teeth it to anchor the escapement wheel t5@ against furtherrotation.

In order properly to center the cardboard cylinder 53 relative to theshaft 55, the shaft 55 is provided with a shouldered disc 'Vi having aconcentric diminished portion 'i8 to t the inner periphery of thecylinder 53 with the lateral edge of the cylinder 53 abutting againstthe enlargement l@ of the shouldered disc il. The enlargement 'i5 alsohas an inwardly protruding pin 715' to pierce the end of the cylinder 53and thus facilitate a positive drive.

To engage the other end of the cylinder 53, there is provided a secondshouldered disc having a diminished portion 5l to engage the innerperiphery of the cylinder 53 and the lateral outer edge of the cylinder53 engaging the lateral face of the enlargement 82. The shouldered disc55 is provided with a centrally located tapered opening 83 to receivethe tapered end 8d of the pin 85 extending through the journal 85 inco-axial alinement with the shaft 55. The journal B5 in thev presentinstance is mounted in the cheek plate d5.

In order to facilitate insertion and removal of the cylinder 55 fromengagement with the shouldered discs il and 30, the pin 85 is removablymounted in the journal 86 and provided with an adjusting screw 88screw-threadedly connected to the journal 86 with the locking point81'to engage and anchor the pin 85 in proper position when the cylinder53 is properly mounted.

The lamp housing l1 in the present instance consists of a removable wall89, a front wall Sli and suitable side walls 5l provided with the bosses52 to receive the rods 93 extending down from suitable bracketsconnected to the channel 46 and connected at their lower ends to themetal straps 94 extending rearwardly from the plates |8. In other words,the lamp housing |1 is slidably mounted on the rods 93 to facilitateaccess to the ticker and adjustment of partsand the like. The upper endof the lamp housing is preferably inclined with a front inclined topwall 95 spaced from the rear wall 89 to form an opening to communicatewith the llower end of the flue I6 when the rear wall is positioned asshown in Fig. 2.

The lamp housing I1 of course cannot be raised due to this flue I6 untilthe wall has been removed. The lower end of the lamp housing |1 ispreferably provided with an inclined wall 96 at its rear end providedwith a spring 91 to press an angle mirror 98 into position against theinclined supports 99. Between the inclined wall 96 and the front wall90, there is provided another inclined wall |00 to form a support forthe condensing lens |0| adjacent the light aperture |02 across which thetape passes after leaving the rollers 34 and 35 on its Way up to the rod43. Forwardly of the light aperture |02, there is formed an inclinedwall |03 connected by the side walls |04 to the side Walls 9| of thelamp housing |1 to form a support for the angle mirror |05, the lowerend of the wall |03 being spaced from the front face of the wall |00 topermit the passage of tape therebetween.

The lamp housing is also provided with suitable supports for thecondensing lenses |00 and |01 between the angle mirror 98 and the lamp|08 secured in a horizontally extending socket |09. The lamp housing isalso provided with a suitable support for the spherical reflector i0 todirect the light rays from the lamp |08 through the condensing lenses|01 and |05 onto the angle mirror 98. The lamp housing is also providedwith two arms extending from the wall thereof to support the housing H2of the objective lens unit so that the image impressed light beam after`passing through the tape and being deflected upwardly by the mirror |05will be received by the objective lens unit mounted in the housing ||2and directed upwardly onto the inclined mirror |3 suitably securedadjacent to the top 1 of the cabinet. The light rays are in turndeflected by the mirror I3 onto the inclined mirror ||4 by it to bedeflected onto the rear face of the screen 9 so that the message may beread from the front face of the screen 9.

The housing 40 in the present instance preferably contains an automaticcontrol, see disclosure in Patent No. 1,908,333, including anelectromagnet H5, the conductor ||6 of which is preferably operativelyconnected to the control relay of the printer 32, which electromagnet||5 is in turn connected by the conductor ||8 to one terminal |9 of aswitch |20 connected to the feed lines |2| and |22 respectively, theother terminal |23 of the switch |20 being connected by the conductor|24 to complete the return circuit.

The electromagnet |5 is in turn provided with an armature |25 pivotallyconnected to the conductor |26 connected to the conductor ||8 andoperable to engage the contact |21 of the conductor |28 which isconnected to one terminal of the motor 3| by the conductor |29, to oneterminal of the lamp |08 by the conductor |30 and to one terminal of thelamp |3| of the advertising machine by the conductor |32.

The conductor |24 on the other hand is connected as an instance to theconductor |33 which in turn is connected to the other terminal of theout of position to anchor lamp |3| by the conductor |34, to the otherterminal of the motor 3| by the conductors |35 and |36 and to the otherterminal of the lamp |08 by the conductors |35 and |31. v

The lamp |3| isshown in Fig. 3 as of the long tubular type andpreferably mounted behind the upper frame |38 above the glass window 8and in the curved reflector |39, the lower end of which |3| indirectlyto illuminate the advertising material carried by the chains 23.

It is obvious that various changes and modifications may be made to thedetails of construction without departing from the general spirit of theinvention as set forth in the appended claims.

I claim: v

1. The combination-with a broa-d tape, of a page printer for markingsaid tape, a vertically extending projection field, and a tape movingdevce for drawing the tape upwardly through said projection field withthe lines of printed matter extending transversely of the tape andhorizontally, said tape moving device including'a continuously operatingmotor, a drive operatively connected to said motor, a tape take-uproller, a slippage device for drivingly connecting 'said tape take-uproller with said drive, an escapement for anchoring said roller againstrotation with said drive, and a control responsive to deflections in thetape when said printer advances the tape a line space initially to drawthe tape across said projection ile'd and operatively connected to saidescapement to actuate said escapement into and said roller againstrotation With said drive.

2. IThe combination with a broad tape, of a page printer for markingsaid tape, a vertically extending projection fiel-d and a tape movingdevice for drawing the tape upwardly through said projection ileld withthe lines of printed matter extending transversely of the tape andhorizontally, said tape moving device including a continuously operatingmotor, a drive operatively connected to said motor, a tape take-upro-ller, a slippage device for drivingly connecting said tape take-uproller with said drive, an escapement for anchoring said roller againstrotation with said drive including an escapement wheel having aplurality of teeth spaced from one another, a bar cooperating with saidteeth to obstruct the path of movement of the same and thereby anchorthe escapement wheel against rotation, and an arm operatively associatedwith said bar and in engagement with the tape in the tape when saidprinter advances the tape a line space initially to draw the tape acrosssaid projection field and in turn to move said bar into or out ofposition to obstruct the rotation of said escapement wheel.

3. A tape'moving device for drawing a tape through a projection ileldincluding a continuously operating motor, a drive operatively connectedto said motor, a tape take-up roller, a slippage device for drivinglyconnecting said tape take-up roller with said drive, an escapement foranchoring said roller against rotation with said drive, and a controlresponsive to deflections in the tape, said control including two`supports above the projection field across which the tape passes, apivotally mounted arm resting on the tape between said supports anddrawing the tape upwardly across the projection field as it is suppliedto the projection field and means operatively connecting said arm tosaid escapement to actuate said escapement into and out of posi- 1s opento permit the light rays from the lamp to respond to deflections tion toanchor said roller said drive.

4. A tape moving device for drawing a tape through a projection eldincluding a continuously operating motor, a drive operatively connectedto said motor, a tape take-up roller, a slippage device fordrivingly'connecting said tape take-up roller with said drive, anescapement for anchoring said roller against rotation with said driveincluding an escapement wheel having a plurality of teeth spaced fromone another, a bar cooperating with said teeth to enter the path ofmovement of said teeth in turn to obstruct the rotation of saidescapement wheel, supports above out. of rotation with the projectionfield across which the tape passes,

an arm in engagement with the tape between said supports to respond todeflections in the tape, said arm by its own weight drawing the tapeupwardly across the projection eld, and means operatively connectingsaid arm with said bar in turn to actuate said bar into and out ofposition to obstruct the rotation of said escapement wheel.

5. 'I'he combination with a vertically moving tape, of a verticallyextending projection eld, a lamp, optical elements for directing a beamof light downwardly from said lamp and laterally through the tape atsaid projecting eld, said lamp and optical elements being disposed toone side of said tape, a vertically extending rear projection screen,and optical elements for receiving the image impressed light beamleaving the tape and directing it upwardly and then laterally, thereuponabove the path of movement of said tape and away from the screen andthereupon horizontally onto the rear face of said screen, said screenand latter optical elements being disposed to the other side of saidtape.

6. The combination with a tape, of a vertically extending projectioneld, a lamp housing, a lamp in said housing having a horizontallyextending socket, .optical elements including a spherical mirror and aplurality of plano-convex spherical condensers for directing a beam oflight downwardly from said lamp, an angle mirror for intercepting thedownwardly directed beam of light and deecting it laterally through avertically extending tape at the projection eld, an angle mirror beyondthe tape for intercepting the image impressed light beam and directingit upwardly, a vertically extending rear projection screen, opticalelements including two inclined mirrors and an objective lens unit forintercepting the image impressed light beam deected upwardly by saidsecond angle mirror and directing it rst away from said screen andthereupon back onto the rear face of said rear projection screen, and acasing for said objective lens unit secured to, said lamp housing.

7. 'I'he combination with a marked tape, of a cut plano-convex sphericalcondenser having its plane face disposed in a vertical directionadjacent the path of movement of said marked tape, a lamp housing, alamp in said housing, optical elements including a spherical convexmirror and a pluralityV of plano-convex spherical condensers fordirecting a beam of light downwardly from said lamp, an angle mirror forintercepting the downwardly extending beam of light and deecting itlaterally through said cut condenser and through the tape, a secondangle mirror for intercepting the image impressed light beam passingthrough the tape and defiecting it upwardly alongside of said tape, arear projection screen,

and disposed adjacent to,

optical elements including a pair of inclined mirrors and an objectivelens unit for intercepting the upwardly deflected image impressed lightbeam and directing it first away from said screen above the path ofmovement of said tape and thereupon back onto the rear face of saidscreen and a casing for said' objective lens unit secured to, anddisposed adjacent to, said lamp housing.

8. The combination wtih a support, of a broad tape, a page printer formarking said tape, a lamp housing vertically slidable on said supportabove said printer, said lamp housing including a lamp, light rays fromsaid lamp downwardly, guides for enabling the tape to move verticallyupward without interfering with the vertical movement of said housing, aplano-convex condenser having its plane face movement of the tapedelivered by said printer, and an angle mirror for intercepting thedownwardly extending beam of light rays and deflecting it through saidcondenser and said tape to form an image impressed light beam.

9. The combination with a cabinet having a rear projection screenadjacent its upper end, of a broad tape, a page printer for marking saidtape, vertically extending rods supported in said cabinet to extendupwardly from said printer, a lamp housing slidable on said rods tofacilitate access to said printer, said lamp housing including a lamp,optical elements for directing a beam of light rays from said la'mpdownwardly, a planoconvex condenser having its plane face extendingvertically, a tape moving device for moving the tape upwardly from saidprinter across the plane face of said condenser without interfering withthe vertical movement of said housing, an angle mirror for interceptingthe downwardly extending beam of light rays and deflecting it throughsaid condenser and said tape to form an image impressed light beam, andother optical elements for intercepting the image impressed light beamso formed and deecting it upwardly and then laterally onto the rear faceof said projection screen.

10. The combination with a broad tape, of a page printer for markingsaid tape, a cabinet having a rear projection screen and a window, aprojecting device, tape moving means for moving the tape as it isprinted by said printer through -the projection field of said projectingdevice, a

lamp for said projecting device for forming "images of the markings onthe tape and directing them onto the rear face of said screen, aplurality of advertising displays, means for successively exhibitingsaid displays at said window, a lamp for illuminating said displays, amotor, means for operatively associating said motor with said tapemoving means and with said exhibiting means, and a control including anelectromagnet and an electric circuit'including a switch, said lamps andsaid motor, said electromagnet being operatively associated with saidprinter to close said switch when the line circuit of said printer isclosed in turn simultaneously to illuminate said lamps and initiate theaction of said motor.

11. The combination with a cabinet having a removable wall andvertically extending supports adjacent to said wall, of a tape, aprinter for marking said tape disposed in said cabinet, a lamp housingvertically slidable on said supports above said printer, a lightaperture frame in said lamp housing, and guides for enabling themovement of said tape from said printer across said light apertureframe, said wall cooperating with optical elements for directing a beamof disposed adjacent the path of4 guides upwardlyand then back over saidlamp said lamp housing to anchor said housing against vertical movementwhen said wall is in closed position. l

12` The combination with vertically extending supports, of a tape, aprinter for marking said tape, a lamp housing vertically slidable onsaid supports above said printer, a light aperture frame in said lamphousing, and tape drawing means for drawing the tape .upwardly acrosssaid light aperture without interfering with the vertical movement ofsaid housing.

13L\ The combination with a tape, of a printer `for marking said tape, avertically extending projection\ field, a tape take-up device, aslippage device for drivingly connecting said take-up device with saidmotor, an escapement for anchoring said take-up device against rotationwith said motor, and a control responsive to deflections in the tapewhen said printer advances the tape a line space to draw thetape acrosssaid projection field, said control including two supports above saidprojection eld across which the tape passes, a pivotally mounted bracketresting on the-tape between said supports and drawing the tape 25 acrossthe projection eld as it is advanced by vvances the tape a line spacesaid printer, and means operatively connecting said arm to saidescapement to actuate said escapement into and out of position to anchorsaid take-up device in or out of driving connection with said motor.

14. The combination with a tape, of a lamp housing having a lamp and avertically extending projection iield below the level of said lamp,

a printer below said lamp housing, means for drawing the tape upwardlyin a vertical direction across said projection field to one side of rsaid lamp housing, optical elements for directing a beam of lightdownwardly from said lamp to the level of said projection iield and thenlaterally through the tape at said projection field, a rear projectionscreen above the level of said lamp housing, and other optical elementsfor receiving the image impressed light beam leaving the tape anddirecting it upwardly along the 'other side of said tape and then abovethe'path of movement of said tape and thereupon laterally onto the rearface of said screen.

15. 'I'he combination with a broad tape, of a page printer for markingsaid tape, a projection iield, and a tape moving device for drawing thetape through said projection eld with the lines of printed matterextending transversely of the tape and horizontally, said tape movingdevice including a continuously operating motor, a drive operativelyconnected to said motor, a tape takeu'p roller, a slippage device fordrivingly connecting said tape take-up rollerwith said drive,`anescapement for anchoring said roller against rotation wth said drive,and a control responsive to deflections in the tape when said printeradinitially to draw. the tape across said projection eld and operativelyconnected to said escapement to actuate said escapement into and out ofposition to anchor said roller against rotation with said drive.

16. The combination of a tape, a lamp housing having a verticallyextending projectionfield, a printer below said lamp housing, guidesadjacent to and above said lamp housing, means for drawing said tapefrom said printer across said vdownwardly and directing it housing,optical elements associated with said lamp housing for directing a beamof light downwardly along one side of said tape and then laterallythrough the tape at said projection field, a rear projection screenabove and to one side of the path of movement of said tape, and otheroptical elements for receiving the image impressed light beam leavingthe tape and directing trupwardly along the other side of said tape,then directly above said lamp housing and nally back onto the rear faceof said screen.

17. The combination having a vertically extending projection field, atape take-up disposed above said lamp housing, a printer below said lamphousing, mleans also directly above said lamp housing cooperating withsaid take-up for drawing the tape from said printer upwardly and thenback over said lamp housing, optical elements associated with said lamphousing for directing a beam of light downwardly along one side of thetape and then laterally through the tape at said projection field, aprojection screen above and to one side of the path of movement of thetape, and other elements for receiving the image impressed light beamleaving the tape and directing it upwardly along the other side of thetape and then directly above said lamp housing and finally back onto therear face of said screen.

18. The combination of a vertically extending tape, a source of light, arear projection screen above the level of said source but to one sidethereof, optical elements for directing a beam of light from said sourcedownwardly, an angle mirror for receiving the beam of light so directeddownwardly and directing it laterally through said tape, a second anglemirror for receiving the image impressed light beam leaving said tapeand directing it upwardly, an angle mirror above the level of saidsource of light for receiving the image impressed beam of light thusdirected upwardly and directing it downwardly and laterally back oversaid source of light, and an angle mirror directly above said source oflight for receiving the beam of light so directed downwardly andlaterally and in turn directing it laterally back across the path of theupwardly directed beam of light onto the rear face of said screen.

19. The combination of a vertically extending tape, a source thereof,optical elements for directing a beam of light from said sourcedownwardly, an angle mirror for receiving the beam of light so directedlaterally through said tape, a second angle mirror for receiving oflight, a rear projection screen" above the level of said source but toone side of a tape, a lamp housing the image impressed light beamleaving said tape and directing it upwardly, a third angle mirror abovethe level of said source of light, an objective lens unit positioned atthe focal point of the' light beam directed upwardly to invert the imageimpressed light beam and direct it onto said third angle mirror, and afourth angle mirror directly above said source of light for receivingthe imaged impressed light beam reflected by said third angle mirror andin turn directing it laterally back across the path of the upwardlydirected beam of light onto the rear face of saidscreen.

AUGUST D. EITZEN.

